I have a mazda 323 model 1985 (or 1983, I'm not sure, I't my father's).
The problem is that the radiator fan does not switch on.
On the housing of the thermostat are mounted two "bolts" (one of them is the Coolant Temperature Sensor, the other I don't know), each bolt is connected with a cable.
When I disconnect one of these two cables that go to the thermostat housing, the radiator fan switches on and works fine!
So I think that the Coolant Temperature Sensor is malfunctioning.
Also, the thermometer (temperature meter) is not working. Is it using the same sensor?
What do you think?